A Biogeochemical Compromise: The High Methane Cost Of Sequestering Carbon In Restored Wetlands

Hemes, Kyle S.; Chamberlain, Samuel D.; Eichelmann, Elke; Knox, Sara H.; Baldocchi, Dennis D.

doi:10.1029/2018GL077747

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A Biogeochemical Compromise: The High Methane Cost Of Sequestering Carbon In Restored Wetlands

2018
By Hemes, Kyle S. ; Chamberlain, Samuel D. ; Eichelmann, Elke ; ...
Source: Geophysical Research Letters 45(12): 6081-6091

[PDF-1.06 MB]

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Details:

Journal Title:

Geophysical Research Letters
Personal Author:

Hemes, Kyle S. ; Chamberlain, Samuel D. ; Eichelmann, Elke ; Knox, Sara H. ; Baldocchi, Dennis D.

Hemes, Kyle S. ; Chamberlain, Samuel D. ; Eichelmann, Elke ; Knox, Sara H. ; Baldocchi, Dennis D. Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; Sea Grant

OAR (Oceanic and Atmospheric Research) ; Sea Grant Less -
Sea Grant Program:

CASG/CUIMR (California Sea Grant)
Description:

Peatland drainage is an important driver of global soil carbon loss and carbon dioxide (CO2) emissions. Restoration of peatlands by reflooding reverses CO2 losses at the cost of increased methane (CH4) emissions, presenting a biogeochemical compromise. While restoring peatlands is a potentially effective method for sequestering carbon, the terms of this compromise are not well constrained. Here we present 14 site years of continuous CH4 and CO2 ecosystem-scale gas exchange over a network of restored freshwater wetlands in California, where long growing seasons, warm weather, and managed water tables result in some of the largest wetland ecosystem CH4 emissions recorded. These large CH4 emissions cause the wetlands to be strong greenhouse gas sources while sequestering carbon and building peat soil. The terms of this biogeochemical compromise, dictated by the ratio between carbon sequestration and CH4 emission, vary considerably across small spatial scales, despite nearly identical wetland climate, hydrology, and plant community compositions.
Keywords:

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Carbon Sequestration Methane Salt Marshes
Source:

Geophysical Research Letters 45(12): 6081-6091
DOI:

https://doi.org/10.1029/2018GL077747
Sea Grant Document Number:

CASG-R-18-030
Document Type:

Journal Article
Place as Subject:

California
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urn:sha256:7ecd587e2f9ad2691425bb39223f97e33927553252a03dd5aa1865646a3b01f4
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https://repository.library.noaa.gov/view/noaa/43811/noaa_43811_DS1.pdf
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